Replying to Rossi scratch BC wrs sizing?

i have decided that i am going to get the scratch bc skis instead of the karmas. i wanted a ski that would be flexier and fun that were wide for float in pow. i am 6-6'1 and am 160lbs but will probablly gain weight in a few years i hope. i am an aggressive skier and ski big lines, pow, trees, park and groomers to get to those types of runs and doing those fast. i ski 60-70% all mountain and 30-40% park but i am going to get some cheap park skis soon so i dont screw up the nice ones. i need help deciding whether i get the 178 or the 185. the 185s scare me alittle but if they are better for me ill get them. any advice would be great thanks.